AMD-761 Datasheet, PDF (226/264 Pages) Advanced Micro Devices – AMD-761-TM System Controller Software/BIOS Design Guide

Preliminary Information
AMD-761™ System Controller Software/BIOS Design Guide
24081D—February 2002
Registers
-----
Bits
Description
Initialized/
Required
Value
Actual
Value
Key
fcn( )
Notes
0x0x0x0Ch
PCI Latency Timer and
Header Type
31:24 Reserved
00h
r
23:16 Header_Type
00h
r
15:8 Lat_Timer
20h
B
7:0 Reserved
00h
r
0x0x0x10h BAR0:AGP Virtual Address Space
31:25
AGP Base Address Register 0
GART AGP Aperture Address
xxxx_xxxb
24:4 Base Address Low
0b 00_000h
3
Flags BAR0 mem as Prefetchable
1b
2:1 BAR0 Type mem as 32 bits
00b
0
Flags BAR0 as MEMORY
Address Space
0b
A
r
Always 0 = 32 Mbytes
minimum
r
PCI specification
r
PCI specification
r
PCI specification
0x0x0x14h
31:12
11:4
3
2:1
0
BAR1:GART Memory Mapped
Register Base
GART Memory Mapped Base
Address Register
Settable portion of Address
GART Memory Mapped Base
Address Register Low, hardwired
to force 4 Kbytes
BAR1 mem Prefetchable
BAR1 Type mem as 32 bits
Flags BAR1 as MEMORY
xxxx_xh
00h
1b
00b
0b
A
r
r
PCI specification
r
PCI specification
r
PCI specification
KEY:
B= Mandatory BIOS function
A= AGP setup by BIOS
c = Calculated/set by AMD-761™ internal logic
P= Power management setup by BIOS o = Setup by OS or OS driver F = Performance enhancement set by BIOS
r = Hardcoded and reserved
u = PCI operational user interface E = Elective BIOS function
214
Recommended BIOS Settings
Chapter 7